25/07 Lecture 8 - Solutions I

Molality

This is a temperature independent measure of concentration, defined as the mol(solute)/kg(solvent)

Collegiative property

This is a property of a solution dependent on solute concentration and independent on the type of solute

Non-volatile solute

This is a solute resistant to vapourisation

Ideal solution

This is a solution where the contents change and there is no change in volume or intermolecular forces

Real solution

This is a solution where the contents change and there is change in volume and intermolecular forces

Ion pair

This occurs if the molality is high and complete disassociation is not observed, disassociated ion pairs will travel together

Van’t Hoff factor

This is measured as the freezing point depression over the freezing point depression as a non-electrolyte, and it is a way to quantify ion pairing in a solution